<!DOCTYPE html>
<title>CSS Test Reference</title>
<link rel="author" title="Oriol Brufau" href="obrufau@igalia.com">
<style>
body {
  position: relative;
}
.wrapper {
  position: absolute;
  width: 100px;
  border: 5px solid;
  top: 75px;
}
.float {
  position: absolute;
  width: 50px;
  height: 50px;
  left: 0;
  top: 0;
  background: cyan;
}
.bfc {
  position: absolute;
  height: 50px;
  background: green;
}
</style>
<div class="wrapper" style="left: 10px; height: 50px">
  <div class="float"></div>
  <div class="bfc" style="width: 50px; left: 0; top: -75px"></div>
</div>
<div class="wrapper" style="left: 140px; height: 50px">
  <div class="float"></div>
  <div class="bfc" style="width: 75px; left: 0; top: -75px"></div>
</div>
<div class="wrapper" style="left: 270px; height: 50px">
  <div class="float"></div>
  <div class="bfc" style="width: 50px; left: 50px; top: -25px"></div>
</div>
<div class="wrapper" style="left: 400px; height: 100px">
  <div class="float"></div>
  <div class="bfc" style="width: 75px; left: 0px; top: 50px"></div>
</div>
